Double ignition fob internal com



Junf: 26, 1934.

w. WALTHER El AL DOUBLE IGNITION FOR INTERNAL COMBUSTION ENGINES Filed Jan. 5, 193 2 UNITED STATES PATENT OFFICE DOUBLE IGNITION FOR INTERNAL COM- BUSTION ENGINES vWilhelm Walther, Stuttgart, and Alfred Grob, Cannstatt, Germany, assignors to Robert Bosch Aktiengesellschaft, Stuttgart, Germany Application January 5, .932, Serial No. 584,860 In Germany January 9, 1931 3 Claims. (Cl. 123-148) The present invention relates to a double igniignition apparatus D connected with the secondtion for internal combustion engines, in which ary coil 24. The other end of the primary coil both ignition circuits are controlled by a double is connected to earth. The free end of the interrupter having a common cam. In many secondary coil is connected with a distributor 5 cases a double ignition is provided only for one 26 through a change-over switch 27. To the 80 engine in order to have a reserve ignition device terminal 17 of the interrupter C is connected in case of need. Hitherto the interrupter of the one end of the primary winding 28 of the igniauxiliary or reserve ignition device which was tion coil C. The other end is connected with .not in operation constantly ran idle and therethe secondary winding 29 and with the battery fore became worn as much as the working in- 30. The free end of the secondary winding 29 65 terrupter, so that it might happen that the is also connected with the switch 27. reserve ignition device became incapable of op- In the drawing the magneto D is in operation. eration by the wearing out of its interrupter and The rods 18 of the double interrupter are so failed to act when it was needed. It is already disposed that the projection 20 touches the cam known in a single ignition device to employ a 21 and therefore the interrupterB is in operation. Z0 double interrupter in which the rocking contact The switch 27 connects the secondary coil 24 lever can be brought by a device alternately of the magneto D with the distributor 26. If mechanically into and out of contact with the the magneto stops for any reason, the ignition cam. The two interrupters of this double inter-'- coil E can be brought into operation in the rupter are arranged in parallel, so that on raising simplest manner as a substitute ignition device the one rocking contact lever the other is autoby turning the rocking lever 9 of the interrupter matically brought into operation. C, by means of the eccentric 19 and the rods According to the present invention, such a 18, so far towards the stationary contact 2 until double interrupter is employed for a double ignithe projection 22 comes into contact with the 36 tion in which each interrupter belongs to a sepacam 21, and then reversing the switch 2'7 so that 30 rate ignition circuit. By this means the aboveit connects the secondary coil 29 of the ignition mentioned drawback is avoided, and furthermore coil E with the distributor 26. the advantage attained that by the double inter- We declare that what we claim is: rupter the ignition apparatus which is not used 1. An ignition arrangement for internal com- 30 remains without current. bustion engines comprising two separate ignition An example of construction of the invention is systems including an interrupter having two conillustrated in the accompanying drawing. tact breakers and a common actuating cam, one

In the drawing, A denotes a double interrupter of said contact breakers connected with the prihaving the two interrupters B and C, D a magmary coil of one of said ignition systems, the

35 neto electric ignition apparatus, and B an igniother contact breaker connected with the primary tion coil. The double interrupter has two staof the other ignition system, and means to altertionary contacts 1, 2, which are fastened on the natively bring the levers of said contact breakers base-plate 3 of the interrupter. The correspondinto engagement with said cam. ing movable contacts 4:, 5 are mounted on springy 2. An ignition arrangement as claimed in claim 40 bands 6, 7 which are firmly connected to blocks 1, having a common distributor, and a switch 8 and 9 of insulating material. The blocks can for alternately connecting said distributor with rock about pins 10 and 11, and are turned by the secondary coils of said ignition systems. springs 12, 13 towards the stationary contacts. 3. An ignition arrangement for internal com- The springs are secured in an insulated manner bustion engines including a magneto and an igni- 45 to lugs 14, 15 on the base-plate. The screws tion coil, an interrupter having two contact 16, 1'1 serve for securing the springs and in adbreakers and a common actuating cam, one of dition also for the current supply. The blocks said contact breakers being connected with the 8, 9 can be adjusted by a lever arrangement 18 p y w d ng of said magneto, the otherconwhich may be actuated by an eccentric 19, in tact breaker being connected with the primary 50 such a manner that when the projection 20 of of said ignition coil, and means to alternatively the one interrupter touches the cam 21, the probring the levers of said contact breakers into jection 22 of the other interrupter is lifted from engagement with said cam. the cam so that it is placed out of action. To the terminal 16 of the interrupter B is connected WILHELM WALTHER.

55 the end of the primary winding 25 of the magneto ALFRED GROB. 

